Method of three-dimensionally measuring object surfaces

US6542250B1 · kind B1 · utility

Inventors

• Bernd Michaelis · Magdeburg, DE
• Peter Albrecht · Hamburg, DE

Key dates

• Filing date: Jun 21, 2000
• Grant date: Apr 1, 2003
• Expiry date: Jul 17, 2021

Classification

• Technology area (CPC G): Physics
• CPC primary: G06T2207/30164
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

A method of optically measuring a three-dimensional surface by sequentially projecting predetermined patterns onto the surface to generate thereon a predetermined number of temporary images of different intensities. Each of the images is recorded by sensors of at least two matrix cameras and grey values are determined in a pixel by pixel manner of those images. A first approximation value is determined for calculating a first measuring point on the surface, and coordinates of this approximation value are associated on the sensor surfaces of both camera. The grey values of the images of each camera at the positions of the projected points are determined by subpixel interpolation, and a pair of grey scale gradation is detected therefrom. These steps may be repeated until a measuring point is determined by a pair of grey scale gradations analyzed to be similar.